The dipole anisotropies of the IRAS galaxies and the microwave background radiation

Abstract

view Abstract Citations (147) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Dipole Anisotropies of the IRAS Galaxies and the Microwave Background Radiation Yahil, A. ; Walker, D. ; Rowan-Robinson, M. Abstract IRAS 60 micron sources are used to map the local gravitational field, and to determine its dipole component, on the assumption that the infrared radiation traces the matter. The dipole moment is found to point in the direction l = 248 + or - 9 and b = 40 + or - 8, 26 deg + or - 10 deg away from the direction of the velocity of the Local Group relative to the microwave background radiation (statistical sampling errors only). Comparison of the two anisotropies, using the luminosity function of the IRAS galaxies and linear perturbation theory, yields an estimate of the cosmological density parameter of 0.85 + or - 0.16 (statistical IRAS error only), with nonlinear effects increasing the parameter by 0.15 percent. These values are in apparent disagreement with the values of 0.1-0.2 deduced from the Virgocentric infall and the cosmic virial theorem. Publication: The Astrophysical Journal Pub Date: February 1986 DOI: 10.1086/184612 Bibcode: 1986ApJ...301L...1Y Keywords: Galaxies; Infrared Astronomy; Infrared Astronomy Satellite; Relic Radiation; Anisotropy; Background Radiation; Dipole Moments; Error Analysis; Galactic Structure; Virial Theorem; Astrophysics; COSMIC BACKGROUND RADIATION; GALAXIES: GENERAL; INFRARED: SOURCES full text sources ADS |